Power-driven tool.



Nn. 630,599. Patented Aug. a, |899. F'. H. CATHCART.

POWER DRIVEN TUOL.

(Application filed Juy 8, 1897. Renewed July 3, 1899.)

2 Sheets-Sheet l,

@No Model.)

IIHIIIIIIIIIH y A mii w: Nonms PETERS co Pao No. 630,589. Patented Aug.8, |899. F. H. CATHCART.

PWER DRIVEN TOOL.

(Application led July B, 1897. Renewed July 3, 1899.) (No Modal.) 2Sheets-Sheet 2.

VUNITED STATES PATENT OFFICE.

FRANK II. CATIIOART, OF ALEXANDRIA, VIRGINIA, ASSIGNOR TOfTI-IE EMPIREENGINE AND MOTOR COMPANY, OF NEI/V YORK, N. Y.

PowER-DRNEN Tool..

SPECIFICATION forming part of Letters Patent N o. 630,589, dated August8, 1899.

Application led J'uly 8,1897. Renewed July 3, 1899.' Serial No. 722,697.(No model.)

To all whom, it nfl/tty concern.:

Be it known that I, FRANK H. CATHCART, of Alexandria, in the county ofAlexandria and State of Virginia, have invented certain new and usefulImprovements in Power- Driven Tools, of which the following is acomplete specification, reference being had to the accompanyingdrawings.

The object of my invention is to produce an improved tool operated by aself-contained fluid motor or engine whereby the compactness,durability, and general'efciency are materially increased. A

In the accompanying drawings, Figure I is a longitudinal centralvertical section, with parts in elevation, of my machine. Fig. II is asection on the .line II II of Fig. I. Fig. III is a section on the lineIII III of Fig. I.

Referring to the figures on the drawings, 1 indicates one portion of atwo-part cylinder, and 2 the other portion thereof. Each portion isprovided with opposite longitudinal flanges 3 and 4, respectively, whichare constructed to make close joints one with the other and when united,as by screw-bolts 5, to complete the cylinder.

The two-part cylinder above describedis that form which I prefer toemploy; but I do not limit myself to that particular construction. 4shorter than the length of the cylinder-sections in order to providespaces upon the opposite ends for exterior screw-threads. (See Fig. I.)

The screw-threaded ends 7 of the complete cylinder are adapted toaccommodate internally-screw-threaded flanges or rims 8,th at extend,respectively, in opposite directions fromthe cylinder-headcylinder-sections 9 and 10, respectively. The sections 9 and l0 arepreferably formed integrally with end Walls l1 and l2, respectively,which constitute, in effect, cylinder-heads. The Wall l1 is providedwith a closed bearing 13 or box, having an in-l ternal bushing 14. Thewall l2 is provided With a cylindrical bearingr I5, provided With abushing I6. The bushings 14 and 16, being in concentric alinement, areadapted v.to accommodate a piston-shaft 17 ,whichcarries any preferredform of rotatory piston 18, provided with transverse blades orpiston-heads 19.

I prefer also to make the flanges 3 andl 2O indicates the fixed abutmentpiece, which Works in the peripheral depression 2l of the piston andoperatively separates the ports 22 and 23. v 24. indicates afluid-supply-pipe connection adapted, by the aid of suitable valvemechanism, (indicated at 25,) to supply the actuating fluid-as, forexample, steam or airalternately to the ports 22 and 23 as required.

The mechanism above described does not constitute a part of my presentinvention herein described and claimed, but is illustrated by way ofexample of one form of embodiment of a rotary engine.

Coming now to a description of that mechanism which constitutes theembodiment of my present invention, 26 indicates an extension-cylinder,which preferably constitutes a continuation of the section 9 and whichpreferably terminates in a cylinder -head 27, screwed or otherwisesecured to the end of the extension-cylinder. The extension-cylinderVaccommodates a piston-head 28, to which is secured a piston-rod 29,which, working through a packing-box 30 in the cylinder-head, isconnected with a suitable supporting-frame 3l. In a thickened portion ofthe wall of the extensioncylinder I provide steam supply passages 32'and33, communicating with the valve-chamber 34, Within which works asuitable valve-,as, for example, the valve 35 controllable by means of alever 36.

V,37indicates an exhaust-port, and 38 a Huidpressure supply-pipecommunicating with the interior of the valve-chamber, included in themechanism indicated at 25.

Through manipulation of the lever 36 steam fmay be admitted to one sideor the other of the piston 28, thereby feeding the motor to or Afromitswork, as required.

It is frequently desirable in adapting machines of the class to which myinvention belongs to special uses to provide Within the machine a formof reducing or multiplying gear which will not `materially increase thesize or weight of the machine or disiigure the symmetry of its exteriorform. l For this purpose I provide a spindle 39, which is revolublycarried in coaxial alinement with the shaft 17, and upon the contiguousend of the shaft a pinion 40, secured thereto. Meshing IOO with thepinion 40 I provide a gear 4l rotatably mounted, as upon a stud 42, thegear 4l being provided with or laterally secured to a second pinion I3.The second pinion meshes with a gear -I-L, that is secured to thespindle 39.

45 indicates a case which, in connection with the plate 46, madeintegral with the part l2, to which it is secured, as by bolts +L7, inconnection with the stud 42, protects the train of gear above describedfrom the intrusion of dust or other deleterious substance.

By the arrangement above described I provide a compact andself-contained system of reducing-gear that may be concealed by the ease45 and which constitutes but a slight enlargement of the cylinder-headwall 12. Multiplying-gear could of course be substituted for thatillustrated by substitution in the ordinary manner of proper gears andpinions.

Through the employment of the sections 9 and 10, respectively, in themanner described I am not only able to increase the compactness andadaptability of my machine, but in that manner I am enabled to renderthe section 9, carrying the cylinder extension 26, and the section l0,carryingthe reducing-gear, interchangeable with ordinary cylinder-heads,so that any engine of the ordinary type may be converted into aself-contained feedingengine, or vice versa, simply through theinterchange of the parts specified.

1. The combination with a rotary-engine cylinder and piston-shaft, of acylinder-head upon the cylinder, provided with a wall or diaphragm, anda closed shaft-box in the diaphragm for the piston-shaft, of a cylinderextension upon the cylinder-head coaxial with the shaft-box in thediaphragm, a piston working within the cylinder extension, a head uponthe end of the cylinder extension, a pistonrod connected with thecylinder and passing through the head of the cylinder extension, asupporting-frame connected with the piston-rod, and means for supplyingpower alternately to the opposite sides of the piston, substantially asand for the purpose specified.

2. The combination with a terminally-screwthreaded cylinder, piston, andpiston-shaft of a rotary engine, of a terminally-threaded movablecylinder extension adapted to screw upon the end of the cylinder, afixed piston within the movable cylinder cooperating therewith and adiaphragm within the cylinder extension provided with a closed shaftboxto accommodate the piston-shaf t, whereby interchange between thecylinder extension and an ordinary cylinder-head may be convenientlyeffected, as required, substantially as and for the purpose specified.

In testimony of all which I have hereunto subscribed my name.

FRANK II. CA'II'ICAR'I.

IVitnesses:

J. DU PRATT WHITE, torur. C. APPLEGA'IF.,

